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The Fermentation tab is a running record of what the beer did after you pitched: gravity, temperature, pH, volume, and whatever you want to write down. It is the part of Brewgravity you will open most often, usually on a phone, usually standing next to a fermenter.

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Adding a reading

A reading needs whatever you actually measured — nothing is required, and there is no such thing as an incomplete entry:
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SG, °P, or Brix
Enter it in whichever unit your instrument reads in. Brewgravity converts to specific gravity for storage but remembers the unit you typed, so a Plato reading still displays as Plato.
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°C or °F
Beer temperature, not ambient — the difference during active fermentation is frequently several degrees and always in the direction you did not want.
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0–14
Optional, and mostly interesting if you are chasing a specific finish or working with mixed cultures.
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litres or gallons
Useful when you rack, take samples, or account for trub loss.
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text
Krausen fell, dry hops in, moved to the garage, smells like bananas.
Refractometer readings on fermenting beer are wrong unless corrected — alcohol skews the refractive index. Choose the Brix (Refract.) unit and Brewgravity applies the correction using the batch’s original gravity, rather than handing you a number that says the beer stopped fermenting on day three.

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Reading the chart

Readings plot as a gravity curve over time. The two milestones — your OG when you started fermentation, and your FG when you completed it — are marked on the curve automatically, so the chart always has its endpoints. What the shape tells you:
Normal and healthy. Most of the attenuation happens in the first 48–72 hours; the tail is the yeast cleaning up.
A stuck fermentation. Usually temperature, underpitching, or a mash that left too much unfermentable sugar. Two readings 24 hours apart that agree are the actual test — one reading is never enough to call it.
Something is eating what the primary yeast could not. Fine if you meant it with a Brett or mixed culture, worth investigating if you did not.

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Finishing up

When gravity is stable, enter your final gravity and press Complete. Brewgravity records the FG, stamps the completion time, and the session summary gives you the numbers that matter for next time: Those three numbers are the reason to log at all. The next time you brew this recipe, they are what you plan against.